A director and three companies have been charged by the Health and Safety Executive (HSE) with safety offences over the deaths of four Suffolk men who were killed when a steel structure collapsed on them in Great Yarmouth.

Daniel Hazelton, 30, his brother Thomas Hazelton, 26, and Peter Johnson, 42, all from Stanton, near Bury St Edmunds; and Adam Taylor, 28, of Rickinghall Suffolk, were killed at Claxton Engineering Services' Yard on January 21, 2011.

The four worked for Stowmarket-based contractor Hazegood Construction and were tragically killed when the large underground steel cage they were working in collapsed. In 2013 the CPS decided not to pursue criminal charges of manslaughter against any parties.

The HSE has charged:

• Claxton Engineering Services Ltd of Ferryside, Ferry Road, Norwich, Norfolk, under Section 3 of the Health and Safety at Work etc Act (HSWA) 1974

• Encompass Project Management Ltd, of The Gables, Old Market Street, Thetford, Norfolk, under Section 3 HSWA

• David Groucott, director of Encompass Project Management Ltd, under Section 37 of HSWA

• Hazegood Construction Ltd, of Bury Lodge, Bury Road, Stowmarket, Suffolk, under Sections 2 and 3 of HSWA

They have been summoned to appear before Great Yarmouth Magistrates' Court on February 2.

The four friends, who are remembered with a memorial at The Cock Inn in Stanton and memorials in Rickinghall, were working in a tennis court-sized cage below ground level at part of a £1.5million test facility for offshore pipes.